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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0e5924873865d9f6de4f2cba5d5555f44417d53ad7176eece669594d5d1c82' 
  AND token = 'deeKF9JtuPTdBp+QaqonG6ytlyrz7ZU+Vf9lc7R1e7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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