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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac238430ea87b0b230933384ac85b95f61081f087493e750b0f3812613d3f358' 
  AND token = 'WyxZVNrtrxwQm81EYQvXsIH4Cj99nDIx5FNMJQTj878=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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