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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa0bc6eecc0ce9d44b2214e742ec9b60ebe015b791b36a12ff13f56306f31af' 
  AND token = 'wSjSjN1oHO3dJsdDwROCokkPebl4345ssRU7X4yqIVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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