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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f35df84232da2f478828862a8756bc46652514badec2d64969b1cd678efe41' 
  AND token = 'o0VubbEtHjbQwuRRrLu7Cn9kz0Vz93Tcof6zNCLdTqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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