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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca1ad651b49dffd83bdf8870d702ec4871c268c12c5921cefd78bd92a552490' 
  AND token = 'o2imwppXQtwKyBV6F+CCeOunkbu/3BrHvYcrxX0tQR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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