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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eceb4b9d85c759e504383672d62764dc2ad7a2430ca7a4a808bf7bb9f24847e' 
  AND token = 'otps14nF30ZxRkNgf3nS4wZ+ByI+bPwH4+UIYOEZJMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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