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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b05eced5187a0e72a95822e0f7fa844d36d141b22a849f25a953d951e34dcc2' 
  AND token = 'ScnMStqVFurzSU1/MbhwH0m0RELrWLU9FMINUn6MF+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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