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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f204e115cc3e0c88cbcf902251da1828355fbdc4138e14e7b9540409a1facc0' 
  AND token = 'ufgbPUCLJl5JKyrYL8fO1MhJ1IhOqteovKB08W5V5Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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