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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a845cc4807dc085b279e43008d00638e4edcfc38e29a64f21eecef5fdd95eed0' 
  AND token = 'b26POaIudA0UvacDQwWgPx4BPKHrfwBrxLrOfHQ15IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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