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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63831f1830f21b272d6eb6b0ef3cd6188ee9c8cba39d00b364fda118fc07b4c0' 
  AND token = 'eGJFghGiq09mw03pv4CyCYNLXp8vnjqkunj++DISzY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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