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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7530e85bff2228080ff12958a78dd65de31a14d4e2e115edded38ab93830096' 
  AND token = 'OhkehpL/wOtAonoJPHB+LowPPBc0jYPHaNJCS5QAJck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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