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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1a5121c75ec5d3e07eba12355df17dae119663bdd71b29633ec1390f2cb32c' 
  AND token = '0DYYmvdxB78gIPQVwY9vPGHXu+0hDQqa4iwFacfKegY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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