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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02877747e0e2507fc5516ac96462a11d50f1cae99e88feaa57d22485b76aa8e6' 
  AND token = 'ZlKycwVA7YmG7uDyrGFHmIJqMvHELLAnFV70KX8fDlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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