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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3235caec6faef0eac9d6e22b1c8b765dcaacb4c83fffc74b2f4f538c36ad8e8' 
  AND token = 'vGCjdX7fL3nM3LnDGrHCXmPF0NyDFn+J88KYx0xpFYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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