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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e0155fa21ef373ddce6a535803d5bcac526011f3777cd7a591e425d63d7b3c' 
  AND token = 'el+Ed9sKRFNM1x5KJOFs31Fe+2fNysF7QJWC0IZ7Ofc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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