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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a206b28e31e2b9cad67306fbe7dc09471e3f9af4e3e93e2849c4cc6897f520b' 
  AND token = 'BEtkh2+Ghu3Yz3JH/tFHhFPbNpuyTwIBu3iwdMLRi4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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