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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1bf30042a40ed9613a1a7951a131f60c63bc9ed9d62d3a62d60a982c153b15' 
  AND token = 'FzxyztpxWKapXeYbxyH0Y4s1pFlZeq61MC2mdCjHrYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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