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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5aba13ad3bd86094d8709f60d2ce4b738d95082ff6f80afd5df21cd52d014b' 
  AND token = 'an/YwTBR7P9c+9myWrNSQJfYPSijSjzssooArsj8w84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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