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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78f0bcf70d349a6f0f6f00f4bf869d55e6c05e3c2e670f0f5f49aa9c46a723c' 
  AND token = 'V/gKBwgkldjf10XP1QdbQH0BPeU1topzU/CQjMxB/mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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