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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c8394381bfd82a35253b13de1a38404c2b8330d2a73ab62b1831f1eb9a9a82' 
  AND token = 'fUAXVK+cONhmnv1TGi41sVH/HZq5NkNFp/dWSIkHVQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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