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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05823145d49606b07cbf6265d380409843b1bae5364a08857fbc1aa2a9ed4baf' 
  AND token = 'lap2y/fjyWLX2/hbpm+biPwmI0s6pEzWPOZQ/Ioj79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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