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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df510e37bb7b75724b85a5d0dfe0f704ee3a3de76b6a74e620c924f8068f0e0' 
  AND token = '0rFZYH31P8iTna5PVkgm48R0YAGvfSUUY2J6dsKe2K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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