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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee1202461dc2d5bec959f0d31873dacb7b7287f5887a2b83a335e8401f0300d' 
  AND token = '67yVlwBsLTjTdMKM2bLzonMbMuxQC76H2Jc5n8kBtiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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