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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b154165f2060aeac9394316f8e5d43b15fb5d63f6eb35f02dd1bcfbe6a575498' 
  AND token = 'WJ2AWVLWEkVi+Y0U6KYEcf05jkBzmH96TlF/kNYYHX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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