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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be600d1d7730f98c4dd22f6732b26dafdf0426455cc4669aa5c52b17d7bf0149' 
  AND token = 'nxPTld4jOuNdhK/RHEA8asSscMsPr+xBISh0O/iTzB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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