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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f23baf002bbe81a26cd49c822ebccead9c24c2473f6e9f74732c8325cd77ed' 
  AND token = 'Rbt6OwFeoh2qjDZEADkik2gPbjw+jfgoiuJyeUGlDEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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