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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7b3e9248f5d7290fc22c73a4b38fb552b320aad9fdd247de9ee4e815d153c2' 
  AND token = 'lV2DxZbdHtKVOB5RZkwHQg8x+xSxU20VZ2anoa5ST68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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