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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6510215fe0052de2ae83eba9dbf0c2fb302968a3dd9c14c69e017518d4e26455' 
  AND token = 'P5Lq0ZhSui7kIa4QH/mwENMuU4MredGJjPX4YbqmRng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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