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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f593d23cad802477c73ef6f33d92bc3607299151c77e6c599d09e55d7cb8a32' 
  AND token = 'q9CdV6KnKkA1YIVscQs/9CkLjHZHWIeN3dk/ItcILBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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