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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f98e80ecfae30d7bd6a5fe846d12d32f52609fb5c190957bd81fd1e673ddd0' 
  AND token = '/5fp1kqiXxSOiBXwVkB46rDms2tnVhW2d1UCxNlez5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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