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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dee8c5352c0b7fa3bc60a1d6b3d2e5a7b910b64ec2c5cb7b85ed86b639531e' 
  AND token = 'HTTF0wYbn/1AdxQUQ+2unKtW42BCsqA0Ok/jrd0991o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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