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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1e2a7c2065e1713643952554c4bbae148cf0fa9821b92360cc6cf3380da615' 
  AND token = 'Zy5YGiHsKL1Fc2XNPYRvJCGPf/zpmmYET7W33rPbMGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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