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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8e1ed122d4772fc459c3a9628088ad0af1b8ec3131e5e453baf639b4fe6272' 
  AND token = '29ypLf2fVYgeWvLt4R5KJK7rFKuYIkozGgLJA8UomzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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