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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732661ea900136b614e8e32afb299cb95e49c8dd9c3719720fa95f8bef78925d' 
  AND token = 'HZWHNRkXersL/LOmYrflJgN93qVIBxK6NRdxQEKdJIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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