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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ba440b91211a7fe985493449b6e1381ccefabeb66124ce368be1c38a1f6ad9' 
  AND token = '0ZCAwZpd8ogaBOEVL8lTIfHICKwfLc35WjS+i4Kwn4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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