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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3345912276b10eef7630ad573c38d8827177811b75f7d351d83fbf0b1f1d178' 
  AND token = '1n4P4c05hGm80UsBHLn7G/BZifnIa/TdUopRqEWJ/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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