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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6418491b0ef9633ba5123ec0a03a734cd593c8585bee483fcc7c4190750e108c' 
  AND token = '20Nt5h2GVKiPWzRwm0IwyN2Upc1kNiIVRdF+y/4Zxq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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