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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe14f1a8cd71897f8516a47446ba75fff8ab05232caf15cfb6715ad54d416a2' 
  AND token = 'jIQIH88xeIePHxxDS03R+XVtuXult1NvEeq3ZJPqH5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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