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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a34ef454e329fa4ce3aad1c9c5f5ff2ccf3a9eec0c94cf1057c148a7779124' 
  AND token = '49yLWm4izYQ6yGmm19/E+cfTJwoWJlzSx0/8wUZUWfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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