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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c93232b023c17b466551fc17aa95b93f8ba371cbd3ae2e4014d3491f000dbed' 
  AND token = '36CBMlZdV64XU0WDcheuvIVgPzgCQxYdo250+dT99w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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