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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141fca5dc976215b710caba22dd9eb7fa294c31667685ace8992dc7c24b7b1d1' 
  AND token = 'l0iXQY5v315bdONoQy6SH6gwPrWe9a0RnynT0fVnJ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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