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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fe3e225f2e932b6339bf90db1b4b905095a1ed7e3c286c03f87e8edc15f3d8' 
  AND token = '49OOHPaq3ykPG8K2ltnRxDSKSov/0dSWfKID2KSIHxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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