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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6bba2ea054b21ac2c80e29c919e9e6ba43d8db4be097bbd24cc2ab750c3a94' 
  AND token = 'CF3A9nwQqR8mp8Uw2Yzqw3A3U8yzr/BxMBu2y1Dlnjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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