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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7df13c5afdd6c2dcf5d204b3064eab67736acf2e811f164ef1558f0dd6ed77' 
  AND token = 'S7vkHzWEDWaHaqyc2M7QCxFlQf5aKJfrezDlmKkLvmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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