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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf489058ccae975b7c0c20cfca4cc658244666c486ec5ad19735fb8cb0599b0' 
  AND token = 'bPtoAs+ijaMyGYDkMrrNx41QaW+RNEYhhJ3hv8lVUA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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