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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770ada1e67fca3a343a2e17d960763388602fedd92cce3c4611fb35eea0dcc7e' 
  AND token = '0tjwg8VkN+tL/MRgxBKOGey2aisny8BJLsMmycBdcsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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