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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6dad47da88666b7a80b97fa502dc750bd1418832146f3417e948a2c9452b0f' 
  AND token = 'n5cY4libGlZzHT9iY64O1FZnMnh23+q42uxwHaVTnE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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