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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeb2679c760541109f7f75a0e3a38506499499c1efebd2b305c2b7161132669' 
  AND token = '7J3xWS0unH4s/VaV5HMg+t5yx0ChNVn+sqKMArvMRhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}