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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241e44d275b56b8a9c0c8bca2a659459a698245373ad20ab5c89a1950b8c9bad' 
  AND token = 'V5N+k9Kzl/+ViYlTkUrXKFxgM5cxjgO3+2Xu9DbhkRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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