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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b9e6693a8238bc74c0c3f9efec73d6c038767b0990544c6dd0d20053b7cd82' 
  AND token = 'NEezhhhJ9gA7IlWosoumk9Ld84M1hRu90dFCKySTQBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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