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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4c092829a6da6fb0cd4bc7277c2f8d8b2292b31c380cfe0a1b653b43d9a531' 
  AND token = '7fRqIcL2WICxmbO2Mnio6+vxyTxu3b3Xo3ilO+s5+No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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