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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4468c5edabe52f2b8118328ea41b1026ca42c24494c9755c093f924d170cf22a' 
  AND token = 'otFgQ5nlRYyd5zHWiP6LusAOHIx3NlVrlWloUhRoiQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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