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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9847129d6125a83194f6b9328e358e78243ac9e4d45ffeefea7b48a3200b01' 
  AND token = 'Fzev/TSEkg+ZTkH/f9/vMvIVJAi6Hl90WkndxCa4BuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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