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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618798dab0c73a4b8597ea4011828442948c2a8b5e0773b18f8ec3937ea9ed45' 
  AND token = 'ai0s2tWydlIFVH5pYCvhVRD39mEvmkfBlBE8vcbApjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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